Incandescent-lamp lock.



. MACKIN.

Patented June 13, 1911.

INGANDESGBNT LAMP LOCK.

APPLICATION FILED JULY 21, 1910. 994854=g zml.

@M buie we o .tains to .make and .use the same.

new :and yuseu v Icent-Lamp Locks; .and I do declare the fol y siriane PAT-EME @ERICE l 5mn oscar. ,mr aonnsrovN, Plenarias'irnvaarin,v nssmnon To may m SNFUBD BT31138313',y 10F JUHNSTOWN, PENNSYLVANIA..

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i .vredimionlfeftmiewnt Patented J une y13, l191th application mea nuy'zi', 'larok semina. $73,081.]

-Be it known that I, ALvinQ. om, ai citizen 'of the :United States, fresiding at; Johnstown, in the county. of Cambria fand?l 4Stateof Pennsylvania, have invented certain? Improvements lin .Incandes-I `lowingtobe a -full,\.clear, and-exact descrip-g Stion of the invention, such as will enable;

others skilled in the art Lto -whichit4 apper-l This invention relates .to im rovements in v:locking-attachments for incan escent lamps.

' One-object of the invention is to .provide 'an .attachment -of this -character adapted -to .be screwed -into locked'engagement with an ordinary; incandescent lamp socket and having lmeans-whereby .a .lamp will be locked when screwed into engagement vtherewith thus fpreventing -the removal yby unauthori-zedjpersons ,-of-either .the lamp or .the lockin attachment.

ffith the 4foregoing and other Iob]ects m "view, the invention consists of certain novel .andlamp showing the `aplioation of the features of construction, combination and arrangement of parts las .will homere-:fully described :and particularly lpointed out an` thelappended-claims.

iln ythe accompanying drawings: vFigure 1 isa sideview lof :in-incandescent lamp socket invention; Fig. .2 `1s a sim r view with the socket and casingofthe attachment in section; .Fig-3 isvan enlarged vertical sectional v`vieww 'ofthe attachment; Fig. .4 isa cross sectional `vview on the line 4-4 of Fig. 3; Fig. ..5 :is a 'similar view on the line `5-5 of Fig.

3; Fig. 6 vis asimilar .view `on the line 6-6 of `Fig-3.

ln the embodiment of the invention I provide a threaded lamp receptacle or socket 31 .to =t-he ,inner end of which is secured a tubular current-conducting 'stem 2 Ahaving on or cover' an msulatmg of lthe socket 1 whereby .the latter is y,insulated from said stem and plate. The

outenend of the stem is Ialso Vprovided with an insulated disk .7 which is'engaged. with the @inner side ofthe outer contact lplate 4 :and preferably .projects Alaterally therebethe outer portion of the finsu ating sleeve 5 and has its outer end turned back'and .bent into -the form of a spring coil which is of greater vdiameter than-the inner coiled ortion of therod and which forms a hea 12 adapted-'to be screwed into engagement with the lamp receptacle of an ordinary socket see Fig. 4. The coilsofthe ,wirecforming'the head lprovide lthreads which olo'sel enga e the threads of-.the lamp receptac e of-` e socket Awhereby when the Aattachment is screwed into engagement with the lamp -re ceptacle said coils will bind A against the threaded sides of the receptacle and thus yhold the attachment in -tight engagement with the socket'.

-The sleeve 11 formed by the inner coils of the wire rod loosely= engages and is adapted to turn ons-the insulated sleeve 5 of the stem 2 and the lower -or inner end of the coiled wire sleeve 11 increases gradually in diameter and the terminal of-said .inner end is turned slightlydownwardly and-beveled to form a stop zpawl A13 which, when the attachment is turned in -the proper direction for screwing the coiled wirejhead 12 into engagement with the lamp receptacle of the socket will len age the stop lug 10 `on the bearing -plate thereby holding the stem 2 and its insulating -sleeve 5 against revolving in the coiled wire sleeve 11 and causing the latter and the coiled wire head 12 to turn or revolve with the movement of the attachment thus screwing said coiled wire head'12 :into engagement with the lamp receptacle of thesocket until the contact plate 4 on the outer end of the stemcomes =into engagement with the contact-terminal in the lamp receptacle. When the parts are thusengaged any attempt to unscrew the coiled wire head 12 from the lamp receptacle of the socket will result the stem1-2fand insulated sleeve 5 revolving loosely in ,the

coiled wire sleeve 11 .and causingv thesfsicpw and removal ofthe lamp after the Vsame has .dinar lam socket. l y P pawl 13 to play loosely over the stop lug 10 which, owing to the tight engagement of the coiled wire head 12 with the threads of the lamp receptacle will prevent said head from being unscrewed from the lamp receptacle of the socket. When the lamp receptacle or socket 1 of the attachment and the stem 2V and insulating sleeve 5 are revolved the awl 13 will engage and slide around on the bearing plate 8 and the lower coils of the enlarged portion of theV sleeve 11 will engage the flange 9 which will hold this end of the coiled wire sleeve in position and revent the same from expanding or sprea ing outwardly.

In addition to the means for locking the attachment to the lamp receptacle of an ordinary socket, I also provide means for locking the lamp into engagement with the lamp receptacle or socket 1 of the attachment. The locking means for the lamp `comprises a coil lllof stiff spring wireoone end ofV which is bent inwardly and beveled to form a pawl 15 which projectsv through an aperture 16 formed in the side Vof the socket or receptacle l. The inwardly projecting end of the pawl 15 is adapted to frictionally engage the threaded plug on the end of the lamp when said plug is screwed into the socket thereby preventing the unscrewing been screwed into operative engagement with the socket. When the lamp has been screwed into operative en agement with the socket the `central termina of the lamp plug will be brought into electrical contact or engagement with the contact plate v3 on the inner end of the stem 2 thereby connecting one terminal of the lamp, the circuit'to the other terminal bein completed through the threaded surface o the plug of the lamp,

Athe receptacle Vor socket 1 and the coiled wire sleeve 11 which is' in electrical connection with the lamp receptacle of the ordinary lamp socket as hereinbefore described.

Theattachment is inclosed in a suitable shell or casing 17 which is csnstructed and arranged similarly to the casing ofy the or- An attachment constructed in accordance 'with my invention will be automatically locked or fastened into engagement with an ordinary lamp socket whenV screwed into the lamp receptacle thereof and 'a lamp when screwed into engagement with the attachnu'nt will be automat-'ically locked'thereby sg. inst casual removal. When thus engaged with the ordinary lamp "socket the lamp 'will be under the control of the usual switch arranged in the socket.

soy

This lamp cannot be removed from* the y y"socket 1 after it is once applied thereto with` 'out breaking the glass bulb to permit the insertionk of a suitableimplement between the casingl? andthe socket 1 to disengage the pawl 15-from 'the lamp plug as the free 1. A locking attachmentfor incandescent lamps comprlsingv a lamp receptacle or socket, an insulated stem secured to said socket, a sleeve. arranged on said insulated stem, a spring head formed on the outer end of said sleeve and adapted to be screwed into v frictional engagement with the 1lamp receptacle of an ordinary lamp socket, a pawl and ratchet connection between the inner end 'of said sleeve and said socket whereby said spring head may be screwed into engagement with said receptacle but cannot be unscrewed therefrom, and means to lock a lamp in operative en gement with the receptacle or socket of t e attachment.

2. A locking attachment for incandescent lamps comprising a lamp receptacle or socket, an insulated stem secured to the inner end of said socket, a coiled wire sleeve arranged on said stem, a coiled wire head formed on the upper end of said sleeve and adapted to be screwed into engagement with lthe lamp receptacle of an ordinary lamp socket, contact plates arranged on the opposite ends of said stem whereby an electrical connection is made between the central con? tact of the lamp socket and the central contact of the lamp, 'a pawl and ratchet connecsocket, a sleeve loosely mounted on said stem and having means for engagementvwith an ordinary lamp socket, connecting means for said sleeve and 'said rst-mentioned socket operable to lock said sleeve against turning on said stem when the socket 1s turned in one direction and to permit it to turn when the socket is turned in the other direction, and

means to lock a lamp in operative engagement with the socket in said attachment.

4. In an attachment of the character described a lamp receiving socket, an insulated current conducting stem secured to said socket, a coiled wire sleeve .loosely mounted on said insulated stem, a coiled wire head formed on the end of said sleeve, the coils of said head forming spring threads adapted to tightly engage the threaded lamp receptacle of an ordinary incandescent lamp socket, a pawl and ratchet connection between the inner end of the said sleeve and the lamp socket of the attachment, and means to engage and ylock the threaded end of the lamp when screwed into the socket.

5. A locking attachment for incandescent lamps comprising a threaded socket, a tubular current conducting stem secured to said socket, Contact plates arranged on the opposite ends of said stem, an insulating sleeve and disk arranged on said stern whereby the latter and said contact plates are insulated from said sockets, a bearing plate secured to the inner end of the socket, a stop flange formed on one edge of said plate, a ratchet lug arranged on said plate, a coiled wire sleeve arranged on said insulated stem, a spring pawl formed on the inner end of said sleeve and adapted to engage the pawl on said plate, a coiled wire head formed on the opposite end of said sleeve and adapted to be screwed into engagement with the lamp receptacle of an ordinary lamp socket and a casing adapted to inclose the lamp receptacle or socket of the attachment and the parts connected therewith.

In testimony whereof I have hereunto se my hand in presence of two subscribing witnesses.

ALVIE OSCAR MACKIN. Witnesses:

W. J. LAMBERD, KATE DAILEY'. 

